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          常用控件
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        <h2 id="常用控件"><a class="markdownIt-Anchor" href="#常用控件"></a> 常用控件</h2>
<blockquote>
<p>Qt 为我们应用程序界面开发提供一系列的控件，下面介绍几种常用控件，所有控件都可以通过帮助文档获取</p>
</blockquote>
<h3 id="1-qlable标签控件的使用"><a class="markdownIt-Anchor" href="#1-qlable标签控件的使用"></a> 1、QLable(标签)控件的使用</h3>
<blockquote>
<p>可以显示文字  普通文本和动画</p>
</blockquote>
<ul>
<li><strong>设置标签文本  链接</strong></li>
</ul>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//.h</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifndef</span> WIDGET_H</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> WIDGET_H</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;QWidget&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QLabel&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Widget</span> :</span> <span class="keyword">public</span> QWidget</span><br><span class="line">&#123;</span><br><span class="line">    Q_OBJECT</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    Widget(QWidget *parent = <span class="literal">nullptr</span>);</span><br><span class="line">    ~Widget();</span><br><span class="line">    QLabel *label;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span> <span class="comment">// WIDGET_H</span></span></span><br><span class="line"><span class="comment">//.cpp</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;widget.h&quot;</span></span></span><br><span class="line"></span><br><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">this</span>-&gt;resize(<span class="number">800</span>,<span class="number">600</span>);</span><br><span class="line">    label = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label-&gt;resize(<span class="number">200</span>,<span class="number">100</span>);</span><br><span class="line">    label-&gt;<span class="built_in">move</span>(<span class="number">50</span>,<span class="number">50</span>);</span><br><span class="line">    <span class="comment">//label-&gt;setText(&quot;我是一个标签&quot;);</span></span><br><span class="line">    label-&gt;setText(<span class="string">&quot;&lt;a href = \&quot;http://www.baidu.com\&quot;&gt;百度一下&lt;/a&gt;&quot;</span>);</span><br><span class="line">    label-&gt;setOpenExternalLinks(<span class="literal">true</span>);<span class="comment">//设置点击链接自动打开</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<a id="more"></a>
<ul>
<li><strong>设置标签显示图片</strong></li>
</ul>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//.h</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifndef</span> WIDGET_H</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> WIDGET_H</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;QWidget&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QLabel&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Widget</span> :</span> <span class="keyword">public</span> QWidget</span><br><span class="line">&#123;</span><br><span class="line">    Q_OBJECT</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    Widget(QWidget *parent = <span class="literal">nullptr</span>);</span><br><span class="line">    ~Widget();</span><br><span class="line">    QLabel *label;</span><br><span class="line">    QLabel *label_img;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span> <span class="comment">// WIDGET_H</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//.cpp</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QPixmap&gt;</span></span></span><br><span class="line"></span><br><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">this</span>-&gt;resize(<span class="number">800</span>,<span class="number">600</span>);</span><br><span class="line">    label = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label-&gt;resize(<span class="number">200</span>,<span class="number">100</span>);</span><br><span class="line">    label-&gt;<span class="built_in">move</span>(<span class="number">50</span>,<span class="number">50</span>);</span><br><span class="line">    <span class="comment">//label-&gt;setText(&quot;我是一个标签&quot;);</span></span><br><span class="line">    label-&gt;setText(<span class="string">&quot;&lt;a href = \&quot;http://www.baidu.com\&quot;&gt;百度一下&lt;/a&gt;&quot;</span>);</span><br><span class="line">    label-&gt;setOpenExternalLinks(<span class="literal">true</span>);<span class="comment">//设置点击链接自动打开</span></span><br><span class="line"></span><br><span class="line">    label_img = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label_img-&gt;resize(<span class="number">200</span>,<span class="number">100</span>);</span><br><span class="line">    label_img-&gt;<span class="built_in">move</span>(<span class="number">200</span>,<span class="number">50</span>);</span><br><span class="line">    <span class="comment">//label-&gt;setText(&quot;我是一个标签&quot;);</span></span><br><span class="line">    label_img-&gt;setPixmap(QPixmap(<span class="string">&quot;../image/earth.jpg&quot;</span>));</span><br><span class="line">    label_img-&gt;setScaledContents(<span class="literal">true</span>);<span class="comment">//设置自适应大小</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li><strong>设置标签显示动图</strong></li>
</ul>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//.h</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifndef</span> WIDGET_H</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> WIDGET_H</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;QWidget&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QLabel&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Widget</span> :</span> <span class="keyword">public</span> QWidget</span><br><span class="line">&#123;</span><br><span class="line">    Q_OBJECT</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line">    Widget(QWidget *parent = <span class="literal">nullptr</span>);</span><br><span class="line">    ~Widget();</span><br><span class="line">    QLabel *label;</span><br><span class="line">    QLabel *label_img;</span><br><span class="line">    QLabel *label_gif;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span> <span class="comment">// WIDGET_H</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//.cpp</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QPixmap&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QMovie&gt;</span></span></span><br><span class="line"></span><br><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">this</span>-&gt;resize(<span class="number">800</span>,<span class="number">600</span>);</span><br><span class="line">    label = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label-&gt;resize(<span class="number">100</span>,<span class="number">100</span>);</span><br><span class="line">    label-&gt;<span class="built_in">move</span>(<span class="number">50</span>,<span class="number">50</span>);</span><br><span class="line">    <span class="comment">//label-&gt;setText(&quot;我是一个标签&quot;);</span></span><br><span class="line">    label-&gt;setText(<span class="string">&quot;&lt;a href = \&quot;http://www.baidu.com\&quot;&gt;百度一下&lt;/a&gt;&quot;</span>);</span><br><span class="line">    label-&gt;setOpenExternalLinks(<span class="literal">true</span>);<span class="comment">//设置点击链接自动打开</span></span><br><span class="line"></span><br><span class="line">    label_img = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label_img-&gt;resize(<span class="number">100</span>,<span class="number">100</span>);</span><br><span class="line">    label_img-&gt;<span class="built_in">move</span>(<span class="number">200</span>,<span class="number">200</span>);</span><br><span class="line">    <span class="comment">//label-&gt;setText(&quot;我是一个标签&quot;);</span></span><br><span class="line">    label_img-&gt;setPixmap(QPixmap(<span class="string">&quot;../image/earth.jpg&quot;</span>));</span><br><span class="line">    label_img-&gt;setScaledContents(<span class="literal">true</span>);<span class="comment">//设置自适应大小</span></span><br><span class="line"></span><br><span class="line">    label_gif = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);</span><br><span class="line">    label_gif-&gt;resize(<span class="number">200</span>,<span class="number">200</span>);</span><br><span class="line">    label_gif-&gt;<span class="built_in">move</span>(<span class="number">300</span>,<span class="number">200</span>);</span><br><span class="line">    QMovie * <span class="built_in">move</span> = <span class="keyword">new</span> QMovie(<span class="string">&quot;../image/2007203.gif&quot;</span>);<span class="comment">//建立一个动图对象</span></span><br><span class="line">    label_gif-&gt;setMovie(<span class="built_in">move</span>);</span><br><span class="line">    label_gif-&gt;setScaledContents(<span class="literal">true</span>);</span><br><span class="line">    <span class="built_in">move</span>-&gt;start();<span class="comment">//启动动图</span></span><br><span class="line">    </span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="2-lineedit行编辑"><a class="markdownIt-Anchor" href="#2-lineedit行编辑"></a> 2、LineEdit(行编辑)</h3>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;ui_widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QDebug&gt;</span></span></span><br><span class="line"></span><br><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">    , ui(<span class="keyword">new</span> Ui::Widget)</span><br><span class="line">&#123;</span><br><span class="line">    ui-&gt;setupUi(<span class="keyword">this</span>);</span><br><span class="line">    ui-&gt;lineEdit-&gt;setText(<span class="string">&quot;hello&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">Widget::~Widget()</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">delete</span> ui;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">Widget::on_lineEdit_returnPressed</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    qDebug()&lt;&lt;ui-&gt;lineEdit-&gt;<span class="built_in">text</span>();<span class="comment">//获取行编辑内容</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="3-setechomode设置密码的显示模式"><a class="markdownIt-Anchor" href="#3-setechomode设置密码的显示模式"></a> 3、setEchoMode(设置密码的显示模式)</h3>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">    , ui(<span class="keyword">new</span> Ui::Widget)</span><br><span class="line">&#123;</span><br><span class="line">    ui-&gt;setupUi(<span class="keyword">this</span>);</span><br><span class="line">    ui-&gt;lineEdit-&gt;setEchoMode(QLineEdit::Password);<span class="comment">//设置密码模式</span></span><br><span class="line"><span class="comment">//    ui-&gt;lineEdit-&gt;setEchoMode(QLineEdit::PasswordEchoOnEdit);</span></span><br><span class="line">    ui-&gt;lineEdit-&gt;setTextMargins(<span class="number">5</span>,<span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>);<span class="comment">//设置行编辑间距</span></span><br><span class="line">    ui-&gt;lineEdit-&gt;setText(<span class="string">&quot;hello&quot;</span>);</span><br><span class="line"><span class="comment">//    connect(ui-&gt;lineEdit,&amp;QLineEdit::returnPressed,this,[=]()&#123;</span></span><br><span class="line"><span class="comment">//        qDebug()&lt;&lt;ui-&gt;lineEdit-&gt;text();</span></span><br><span class="line"><span class="comment">//    &#125;);</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="4-自定义控件"><a class="markdownIt-Anchor" href="#4-自定义控件"></a> 4、自定义控件</h3>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;smallwidget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QHBoxLayout&gt;</span></span></span><br><span class="line"></span><br><span class="line">smallwidget::smallwidget(QWidget *parent) : QWidget(parent)</span><br><span class="line">&#123;</span><br><span class="line">    slider = <span class="keyword">new</span> QSlider(Qt::Horizontal,<span class="keyword">this</span>);</span><br><span class="line">    spin = <span class="keyword">new</span> QSpinBox(<span class="keyword">this</span>);</span><br><span class="line"></span><br><span class="line">    QHBoxLayout *layout = <span class="keyword">new</span> QHBoxLayout;<span class="comment">//建立一个布局对象</span></span><br><span class="line">    <span class="comment">//在布局中添加控件</span></span><br><span class="line">    layout-&gt;addWidget(spin);</span><br><span class="line">    layout-&gt;addWidget(slider);</span><br><span class="line">    <span class="keyword">this</span>-&gt;setLayout(layout);<span class="comment">//窗口设置一个layout的布局</span></span><br><span class="line"></span><br><span class="line">    <span class="built_in">connect</span>(spin,</span><br><span class="line">            <span class="keyword">static_cast</span>&lt;<span class="keyword">void</span> (QSpinBox::*)(<span class="keyword">int</span>)&gt;(&amp;QSpinBox::valueChanged),</span><br><span class="line">            slider,&amp;QSlider::setValue);</span><br><span class="line">    <span class="built_in">connect</span>(slider,&amp;QSlider::valueChanged,spin,&amp;QSpinBox::setValue);</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="5-计时器qtimer"><a class="markdownIt-Anchor" href="#5-计时器qtimer"></a> 5、计时器(QTimer)</h3>
<blockquote>
<p>定时触发</p>
<p><strong>使用方式：</strong></p>
<p>第一步：创建一个定时器对象，并指定父对象</p>
<p>第二步：启动定时器，并设置超时时间</p>
<p>第三步：使用连接函数，设置一个超时事件，可以自定义槽函数，也可以使用lambda表达式</p>
</blockquote>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;ui_widget.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string">&lt;QDebug&gt;</span></span></span><br><span class="line">Widget::Widget(QWidget *parent)</span><br><span class="line">    : QWidget(parent)</span><br><span class="line">    , ui(<span class="keyword">new</span> Ui::Widget)</span><br><span class="line">&#123;</span><br><span class="line">    ui-&gt;setupUi(<span class="keyword">this</span>);</span><br><span class="line">    t = <span class="keyword">new</span> QTimer;</span><br><span class="line">    <span class="comment">//设置定时器的超时事件 如果超时会发出一个超时信号</span></span><br><span class="line">    <span class="built_in">connect</span>(t,&amp;QTimer::timeout,<span class="keyword">this</span>,[]()&#123;</span><br><span class="line">       qDebug()&lt;&lt;<span class="string">&quot;timeout&quot;</span>;</span><br><span class="line">    &#125;);</span><br><span class="line">    <span class="comment">//定时器必须启动</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">Widget::~Widget()</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">delete</span> ui;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">Widget::on_pushButton_clicked</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    t-&gt;start(<span class="number">1000</span>);<span class="comment">//启动定时器 1ms超时一次</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">Widget::on_pushButton_2_clicked</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    t-&gt;<span class="built_in">stop</span>();<span class="comment">//停止定时器</span></span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<blockquote>
<p><strong>常见的使用方法如下：</strong></p>
<p>start():启动定时器</p>
<p>stop():暂停定时器</p>
<p>timeout:超时信号</p>
</blockquote>

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